Brake shoe and method of making same



Aug. l1, 1931.y J. w. PETERSON A l 1,818,090

BRAKE SHOE AND METHOD 0F MAKING SAME Filed Jan. l0, 1927 l v. l /0/1/ I INVENTOR F76.v 6 JoHNByxl. PETERSON ur 4ATTORNEY rIl() Patented Aug. 11, 193.1 f 1 j UNITED STATES A'PATENT OFFICE JOHN w. PETERSON, or sou'rn BEND, INDIANA, `AseIaNoal 'ro BENDIX BRAKE com.

PlANY, F -SOUTH BEND, INDIANA, A CORPORATION OE ILLINOIS BRAKE SHOE AND METHOD 0F MAKING SAME Application led lTanuary 10, 1927. Serial No. 160,016.

This invention relates to brake shoes, and is illustrated as embodied ina shoe for an linternal expanding automobile brake. An

object of the invention is to strengthen the shoe, and to facilitate its manufacture by improvements in the method of making it.

he shoeis preferably built up of an outer band, carrying the brake lining, reinforced by one or more stiffening members or webs, and an important feature of the invention relates to providing the edge of the web with projections passing through slots in the band and preferably welded thereto. I prefer to form the band with depressions about the slots, and to weld the projections in such a manner that the material of the projections iiows into and substantially ills the depressions, thus in ei'ect forming integral rivet heads securing the web to the band. An mportant minor feature of the/invention relates to forming the edges of the projections on argsstruck about a center about which the band is swung in assembling the band and web, thus greatly facilitating the assembly of these parts.

Another feature of the invention relates to securing absolute alinement of spaced beara single long bearing member and without any slot, and then separating the bearing member into two spaced bearings by a out which removes the required amount'of material to secure the desired spacing ofthe bearings and which also forms the desired slot in the shoe itself.

The above and other objects and featuresy of the invention will be apparent from the following description 'of one illustrative embodiment. shown in the accompanying drawings, in which:

Fi re 1 1s a perspective view ofthe :fin-v dghoe, looking generally toward its in- L viewing it from the general point of view of the arrows 3 3 of Figure 1; u

Figure 4 is a longitudinal sectlon in a plane corresponding to the line 4-4 of Figure 3,

and showing the band and web being as-i sembled; v f

Figure 5 is a partial elevation of the end of the finished shoe, looking in the direction of the arrows 5-5 of Figure-1; and

Figure 6 is a view corresponding to Figure:

5, but before the lining is attached and before the final cut separating the two bearings. The shoe illustrated 1n Figure -14 is the secondary shoe of a three-shoe automobile brake of the type described generally in Patent No.:

1,628,388, granted Bendix Brake Company on May 10, 1927, on an application of John R. Cautley. The shoe is intended to be anchored on a pivot at one end, at which end it overlaps the anchored end of a cooperatingauxiliar shoe, and at its opposite end it is intende to be connected by a floating pivot to the end of a servo or primary shoe. The

present invention relates to the structure of the shoe and to its manufacture. l

The finished shoe comprises principally an arcuate band 10, to which the linino' 12 is shown secured by rivets 14, and two reinforcing members or stiii'ening webs 16 secured to the inner face of the band 10. Webs 16 are spaced far enough apart so that at their ends they :may straddle the ends of the primary and auxiliary shoes of the brake.

An important feature of the invention relates to the manner of securely fastening the band 10 and webs 16 to ether. The band is formed with a series o slots 18 to lit over rollonded projections '20' on the edge of the we d Y In order to facilitatel assembly ofthe parts,-

the projections 20,on the sidesfurthest from the end of the shoe, areall formed on circular arcs 22 having as their common center the center 24 of the projection 20 at the end of the shoe. In assembling the parts, 'as

shown in Figure 4, the band 10 is swung upon the end lug 20 as a fulcrum, about the center 24, so that each slot 18 swings smoothly over its projection 20 without interference, or'- of course the band 10 may be held and the web 1 spot-welding, substantially to fill the depressions 26 and to form what are in eect integral rivet heads 28 (Figure 2). Since the welding heats the parts, on cooling down after the Welding the web 16 and projections 20 shrink, this forming a very tight and close joint with band 10. f

At the end of the finished shoe there is an opening 38, for the passage ofthe anchored end of the adjacent auxiliary shoe, and which is narrowed down at the end of the shoe to form a mere slot 32, just wide enough to position the auxiliary shoe laterally, extending between lugs 34 on the band 10 and two bushings or bearings 36 secured to the webs 16 and adapted to be mounted on the anchor or fixed pivot of the shoe.

To insure the greatest accuracy of the slot 32, andv of the alinement of bearings 36, I prefer to form the shoe nearly up to the last operation as shown in Figure 6. There is provided an opening 38 in band 10, and a single bearing member 40 having shoulders at itsv ends to engage the inner faces of webs 16.

Flanges 42 on the ends of bearing member 40 are peened or spun over against the outer faces of webs 16, to lock the ends of the bearing member to the webs, or if preferred the ends of the bearing member may be welded o permanently to the webs. I prefer also to strengthen the end of the shoe by arc welds 44 extending from the end of band 10 along the junction with webs-16, at least past the opening 38.

After completing the shoe to the stage .Y shown in Figure 6, the slotr32 is formed by removing the surplus material, as for example by a cutter 46 indicated in dotted lines in Figure 5. This also separates member 40 50 into two bearings 36 absolutely alined with slot 32, and with each other.

At the opposite end of the shoe, bearings 48 may be welded or otherwise secured to webs 16, for the floating pivot of the primary or A servo shoef lWhile a particular shoe, and particular steps in its manufacture, have been described in detail, it is not my intention to limit the-scope of the invention by that description, or otherwise than by the terms of the appended claims.

I claim:

1. A brake shoe comprising, in combination, an arcuate band formed with openings 66 surrounded by depressions, and a strengthening web having projections extending through the openingsl and welded down into the depressions.

2.V A brake shoe comprising in combination, an arcuate band formed 'with slots surrounded by oval depressions and a strengthening web having fiat projections extending outwardl through theslots and welded down into vthe epressions.

3.V That method of manufacturing a brake shoe which comprises forming an arcuate band with openings surrounded by depres- 'sions and forming a strengthenin web with corresponding projections, assem ling them with the projections extending through the openings, and melting the projections down into the depressions by a welding operation.

4. That method of manufacturing a brake shoe which comprises forming an arcuate band with a series of openings, forming a strengthening web with a corresponding series of projections all curved on their corresponding sides about the same center, relatively moving the band and web about said center to assemble them with the projections in the openings, and securing the band and web together.

5. That method of manufacturing a brake shoe which comprises forming an arcuate band with a series of openings, forming a strengthening web with a corresponding series of projections all curved on their corresponding sides about a single center at the end of the web, relatively moving the band and web about said center to assemble them with the projections in the openings, and securing the band and web together.

A blank for the web of a brake shoe comprising a generally arc-shaped piece with projections along its outer edge all curved on their corresponding sides about the same center.

'L lA blank for the web of a brake shoe comprising. a generally arc-shaped piece with projectlons along its outer edge all curved on their corresponding sides about a single center at oneend of the blank.

8. brake shoe having at one end two spaced bearings with inner opposed liat parallel faces, and also having an outer portion formed with a slot extending from its end with its sides accurately positioned in the planes of said faces.

9. A brake shoe having at its end two spaced webs formed with projections, a band extending across said webs and having openlngs recelving said projections, and an arc weld securing at least a part of the outer edgesof the webs to the inner face of the band lndependently of the projections.

10. A brake shoe having at its end two spacedwebs formed with projections, a band extending across said webs and having openings receiving said projections and formed near the end of the shoe with an opening between said webs, and means securing the outer edges of the Webs to the inner face of f the bandfindependently of the projections l band and having at along the' op osite sides of said opening. v

11. A. b e shoe comprising a band formed with openings and a strengthening web having projections extending into the openings and arc-welded, along at least part gf is outer edge, tc the inner face of said 12. A brake shoe com rising, in combination, an arcuate band aving at least one opening, and a separately-formed strengthening web en aging the inner face oi the least one projection extending through said opening and tang the shearing strains tending to se arate the band from the web lengthwise o the shoe and which web is secured to said band.

13. A brake shoe comprising an arcuate, separately-formed band having slots and web members having interlocking tongue along means projecting through the slots talnng shearing strains tending .to separate said members len hwise of the shoe.

14. Abra e shoe comprising an arcuate band having at least one opening, in combina.

tion with a separately-formed web curved its outer edge on the same arc as the inner face of said band and seated against the inner face ofsaid lhand and having at least one rojection extending outwardly through sai opening.

15. A brake shoe comprisin an arcuate band having o enings, a pair o spaced webs curved along t eir outer ed on the same arc as the inner face of said and, said webs having pro'ections engaging said o nings, and means or` securing t e webs to e band.

16. A brake shoe comprisin band havin parallel rows of ots, a pair of webs curve along their outer ed s on the same arc as the inner face of said and, said webs having projections thereon engaging the end walls o the slots and means for securingpltbwebs to the band.

and ada ted to rocked into engagement with a s oe rim having slots correspon to the jections. 18. brake formed with radial projections having sides curved abogt a common center, and a. apted to be rocked about the center into engagement with a shoe having slots.l In testimony whereof, I have hereunto signed my name. r

JOHN W. PETERSON.

an arcuate brake shoe strengthening web formed with progctions extending radially shoe strengthening web- 

